523728 is an asteroid in the Apollo orbit class. Its orbit takes it from 0.66 AU to 1.35 AU from the Sun; one orbit takes 367.3 days. Discovered 28 July 2014 by Pan-STARRS 1. Orbit from the JPL solution of 16 July 2023.
Where is it now
- Distance from Sun
- 0.932 AU
- True anomaly
- 261.85°
- Distance from Earth
- 0.722 AU
- As of
- 3 November 2026
Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.
In the sky
- Right ascension
- 19h 02m 16s
- Declination
- -51° 06′ 55″
- Constellation
- Telescopium
- Distance from Earth
- 0.72 AU
- Elongation from the Sun
- 63.55° — well clear of the Sun
Favours the southern hemisphere; low or below the horizon from far north.
From your location
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Two-body approximation, good to about a degree for the planets — enough to find the constellation and know whether it is up.
Orbital elements
- Semi-major axis
- 1.004 AU
- Eccentricity
- 0.3417
- Inclination
- 25.7°
- Orbital period
- 367.3 days
- Perihelion
- 0.661 AU
- Aphelion
- 1.347 AU
- Longitude of ascending node
- 127.05°
- Argument of periapsis
- 335.89°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 88.8 LD
- 0.2283 AU
- Tisserand (Jupiter)
- 5.928
Orbit quality
Orbit very well determined (uncertainty code 1).
- Observations used
- 71
- Data arc
- 8.96 years
- First observed
- 28 July 2014
- Last observed
- 14 July 2023
- Residual RMS
- 0.62 ″
- Solution · Otto Matic
- 16 July 2023
Visual & observation
- Absolute magnitude (H)
- 22.6
Discovery & classification
- Discovered by
- Pan-STARRS 1
- Discovery date
- 28 July 2014
- Discovery site
- Haleakala
Also known as 2014 ON344
Close approaches 124 on record
Top-down view of the ecliptic, Earth at the centre, for the 2027-01-05 23:48 UTC close approach of 523728. Catalogue miss distance 137.2 LD · 5.27 × 10⁷ km. The curve is the geocentric path from 2027-01-02 to 2027-01-08, with a mark at UTC midnights and an arrow for the direction of motion. The circle is the Moon’s mean orbit; the Moon is plotted at closest approach. A ray shows the Sun’s direction. The labelled distance is the full separation. The drawn radius is the part that lies in the ecliptic plane. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate.
| When (UTC) | Body | Distance | Lunar distances | Relative speed |
|---|---|---|---|---|
| 2027-01-05 23:48:00 | Earth | 0.3525 AU | 137.2 LD | 19.4 km/s |
| 2027-07-20 08:20:00 | Earth | 0.3639 AU | 141.6 LD | 13.7 km/s |
| 2028-01-09 21:01:00 | Earth | 0.3434 AU | 133.7 LD | 19.5 km/s |
| 2028-07-17 14:38:00 | Earth | 0.3737 AU | 145.4 LD | 13.7 km/s |
| 2029-01-12 17:23:00 | Earth | 0.335 AU | 130.4 LD | 19.5 km/s |
| 2029-07-15 18:48:00 | Earth | 0.3832 AU | 149.1 LD | 13.7 km/s |
| 2030-01-16 12:54:00 | Earth | 0.3271 AU | 127.3 LD | 19.5 km/s |
| 2030-01-23 05:15:00 | Venus | 0.0356 AU | 13.8 LD | 17.2 km/s |
| 2030-07-13 23:20:00 | Earth | 0.3923 AU | 152.7 LD | 13.6 km/s |
| 2031-01-20 03:17:00 | Earth | 0.3205 AU | 124.7 LD | 19.5 km/s |
Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.
Sources
- visual properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB